Barrister Error Code (Ruby)

error_code.rb

#!/usr/bin/env ruby

# Client sends invalid parameters to server

require 'barrister'

trans  = Barrister::HttpTransport.new("http://localhost:3000/v1/todos")
client = Barrister::Client.new(trans)

client.TodoManager.deleteTodo(45)     # valid (45 is an int)

begin 
  client.TodoManager.deleteTodo("66") # invalid ("66" is a string, not an int)
rescue Barrister::RpcException => e
  puts "err.code=#{e.code}" # -32602 ("Invalid params" - from the JSON-RPC 2.0 spec)
end